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fix scale down check for sharding #310

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merged 2 commits into from
Nov 29, 2023
Merged

fix scale down check for sharding #310

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87614d8
fix scale down
MiaAltieri Nov 28, 2023
a5465e4
Merge branch '6/edge' into fix-scale-down
MiaAltieri Nov 28, 2023
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10 changes: 6 additions & 4 deletions src/charm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1317,9 +1317,9 @@ def check_relation_broken_or_scale_down(self, event: RelationDepartedEvent) -> N
Relation departed and relation broken events occur during scaling down or during relation
removal, only relation departed events have access to metadata to determine which case.
"""
self.set_scaling_down(event)
scaling_down = self.set_scaling_down(event)

if self.is_scaling_down(event.relation.id):
if scaling_down:
logger.info(
"Scaling down the application, no need to process removed relation in broken hook."
)
Expand All @@ -1334,12 +1334,14 @@ def has_departed_run(self, rel_id: int) -> bool:
rel_departed_key = self._generate_relation_departed_key(rel_id)
return rel_departed_key in self.unit_peer_data

def set_scaling_down(self, event: RelationDepartedEvent) -> None:
def set_scaling_down(self, event: RelationDepartedEvent) -> bool:
"""Sets whether or not the current unit is scaling down."""
# check if relation departed is due to current unit being removed. (i.e. scaling down the
# application.)
rel_departed_key = self._generate_relation_departed_key(event.relation.id)
self.unit_peer_data[rel_departed_key] = json.dumps(event.departing_unit == self.unit)
scaling_down = json.dumps(event.departing_unit == self.unit)
self.unit_peer_data[rel_departed_key] = scaling_down
return scaling_down

@staticmethod
def _generate_relation_departed_key(rel_id: int) -> str:
Expand Down